Gold-thiolate cluster emission from SAMs under keV ion bombardment: Experiments and molecular dynamics simulations

Arezki, Bahia;Delcorte, Arnaud;Chami, AC;Garrison, BJ;Bertrand, Patrick
(2003) Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms — Vol. 212, p. 369-375 (2003)

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Authors
  • Arezki, BahiaUCLouvain
    Author
  • Delcorte, ArnaudUCLouvain
    Author
  • Chami, ACLaboratoire Interactions Rayonnement-Matiere,Algiers, Algeria
    Author
  • Garrison, BJThe Pennsylvania State University, USA
    Author
  • Bertrand, PatrickUCLouvain
    Author
Abstract
In this contribution the emission of gold-molecule cluster ions from self-assembled monolayers (SAMs) of alkanethiols on gold is investigated using time-of-flight secondary ion mass spectrometry (ToF-SIMS). Layers of alkanethiols [CH3(CH2)(n)SH] with various chain lengths (n = 8, 12, 16) have been chosen because they form well-ordered molecular monolayers on gold. First, we compare and interpret the yields and energy spectra of gold-thiolate cluster ions, obtained for different thiol sizes. Our results show that the unimolecular dissociation of larger aggregates in the acceleration section of the spectrometer constitutes a significant formation channel for gold-molecule clusters. Second, we present preliminary results of molecular dynamics simulations performed in order to improve our understanding of the cluster emission processes. These calculations have been conducted using 8 keV projectiles and a long-range term in the hydrocarbon potential in order to account for the van der Waals forces between the thiol chains. (C) 2003 Elsevier B.V. All rights reserved.
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Arezki, B., Delcorte, A., Chami, A., Garrison, B., & Bertrand, P. (2003). Gold-thiolate cluster emission from SAMs under keV ion bombardment: Experiments and molecular dynamics simulations. Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 212, 369-375. https://doi.org/10.1016/S0168-583X(03)01457-5 (Original work published 2003)